Vanadium(II) fluoride

Vanadium(II) fluoride is a fluoride of vanadium, with the chemical formula of VF2. It forms blue crystals.

Preparation
Vanadium(II) fluoride can be produced by the reduction of vanadium trifluoride by hydrogen in a hydrogen fluoride atmosphere at 1150 °C:


 * 2 VF3 + H2 -> 2 VF2 + 2 HF

Physical properties
Vanadium(II) fluoride crystallizes in the tetragonal crystal system with space group P42/mnm (No. 136). Its lattice constants are a = 480.4 pm and c = 323.7 pm.

Reactions
Vanadium(II) fluoride is a strong reducing agent that can reduce nitrogen to hydrazine in the presence of magnesium hydroxide.

It dissolves in water to form [V(H2O)6]2+ ions.


 * V^{2+} + 6 H2O -> [V(H2O)6]^{2+}